AI BriefingReplit Migrates Web App Infrastructure from Heroku to GCP
Key point
Replit migrated its web app's database and hosting environment from Heroku to GCP to gain infrastructure control and flexibility.
Details
Replit fully migrated its infrastructure from Heroku to Google Cloud Platform (GCP) to gain control and flexibility over its infrastructure and support more software creators.
The migration proceeded through the following steps:
- Prototype demo: Conducted a proof of concept in the GCP environment using a test database to identify potential issues.
- Data migration (Phase 1): Migrated Postgres and Redis. Built a Postgres replica on a GCP VM using WAL-E and S3, and switched over the database with a 15-minute maintenance window.
- Data migration (Phase 2): Transitioned from self-hosted Postgres to Google Cloud SQL. Used Postgres native replication to reduce management overhead.
- Frontend migration: Used Cloudflare Load Balancer to gradually redirect traffic to the new servers (starting from 1-5% up to 100%), verifying stability along the way.
This migration was successfully completed with minimal impact on users, following weeks of dry runs and testing of various failure scenarios.
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